C:\>perl -MO=Deparse -e "print for (1..10);print foreach (1..10);"
foreach $_ (1 .. 10) {
    print $_;
}
foreach $_ (1 .. 10) {
    print $_;
}
-e syntax OK
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OK, I'm confused. They parse identically.

Do you mean 'C-style' for loops (for (i=1;i++;i<11))vs 'perl-style' for loops? If so, what you describe is documented in perlsyn.

If not, what do you mean?